Pattern of Variation of Fibril Angle within Annual Rings of Pinus Attenuradiata
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Variation of cellulose microfibril angles in softwoods and hardwoods-a possible strategy of mechanical optimization.
Position-resolved small-angle X-ray scattering was used to investigate the nanostructure of the wood cell wall in two softwood species (Norwegian spruce and Scots pine) and two hardwood species (pedunculate oak and copper beech). The tilt angle of the cellulose fibrils in the wood cell wall versus the longitudinal cell axis (microfibril angle) was systematically studied over a wide range of ann...
متن کاملمطالعه اثر متغیرهای اقلیمی (دما و بارندگی) بر پهنای دوایر سالانه کاج بروسیا Pinus brutia در استان لرستان
Trees have been affected by environmental changes, including climatic conditions. Thus, the study on anatomical and morphological characteristics of tree rings provides the possibility of climate study. The present investigation aimed to study the effect at climatic factors such as temperature (maximum, medium and minimum), precipitation on the growth rings of Pinus brutia. 30 Pinus brutia tree...
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The elastic properties of earlywood and latewood and their variability were measured in 388 specimens from six loblolly pine trees in a commercial plantation. Properties measured included longitudinal modulus of elasticity, shear modulus, specific gravity, microfibril angle and presence of compression wood. Novel testing procedures were developed to measure properties from specimens of 1 mm=1 m...
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Mining operations in the Sudbury district of northern Ontario have resulted in environmental damage caused by acid rain and heavy metal pollution. Remedial liming (Ca/MgCO3) has been used in an attempt to restore the pH of the lake water and soil to natural levels. The spatial and temporal variation of metal concentrations in the annual growth rings of trees may be a useful indicator of the eff...
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Tree rings provide information about the climatic conditions during the growing season by recording them in different anatomical features, such as intra-annual density fluctuations (IADFs). IADFs are intra-annual changes of wood density appearing as latewood-like cells within earlywood, or earlywood-like cells within latewood. The occurrence of IADFs is dependent on the age and size of the tree...
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